diff --git a/01_lesson_tic-tac-toe/package-lock.json b/01_lesson_tic-tac-toe/package-lock.json
index 6183fb87..e1954ada 100644
--- a/01_lesson_tic-tac-toe/package-lock.json
+++ b/01_lesson_tic-tac-toe/package-lock.json
@@ -12596,9 +12596,9 @@
       "integrity": "sha512-4WK/bYZmj8xLr+HUCODHGF1ZFzsYffasLUgEiMBY4fgtltdO6B4WJtlSbPaDTLpYTcGVwM2qLnFTICEcNxs3kA=="
     },
     "terser": {
-      "version": "4.6.6",
-      "resolved": "https://registry.npmjs.org/terser/-/terser-4.6.6.tgz",
-      "integrity": "sha512-4lYPyeNmstjIIESr/ysHg2vUPRGf2tzF9z2yYwnowXVuVzLEamPN1Gfrz7f8I9uEPuHcbFlW4PLIAsJoxXyJ1g==",
+      "version": "4.8.1",
+      "resolved": "https://registry.npmjs.org/terser/-/terser-4.8.1.tgz",
+      "integrity": "sha512-4GnLC0x667eJG0ewJTa6z/yXrbLGv80D9Ru6HIpCQmO+Q4PfEtBFi0ObSckqwL6VyQv/7ENJieXHo2ANmdQwgw==",
       "requires": {
         "commander": "^2.20.0",
         "source-map": "~0.6.1",
diff --git a/01_lesson_tic-tac-toe/yarn.lock b/01_lesson_tic-tac-toe/yarn.lock
index 487d6bbc..ea65fca6 100644
--- a/01_lesson_tic-tac-toe/yarn.lock
+++ b/01_lesson_tic-tac-toe/yarn.lock
@@ -3088,9 +3088,9 @@ bser@^2.0.0:
     node-int64 "^0.4.0"
 
 buffer-from@^1.0.0:
-  version "1.1.1"
-  resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.1.tgz#32713bc028f75c02fdb710d7c7bcec1f2c6070ef"
-  integrity sha512-MQcXEUbCKtEo7bhqEs6560Hyd4XaovZlO/k9V3hjVUF/zwW7KBVdSK4gIt/bzwS9MbR5qob+F5jusZsb0YQK2A==
+  version "1.1.2"
+  resolved "https://registry.yarnpkg.com/buffer-from/-/buffer-from-1.1.2.tgz#2b146a6fd72e80b4f55d255f35ed59a3a9a41bd5"
+  integrity sha512-E+XQCRwSbaaiChtv6k6Dwgc+bx+Bs6vuKJHHl5kox/BaKbhiXzqQOwK4cO22yElGp2OCmjwVhT3HmxgyPGnJfQ==
 
 buffer-indexof@^1.0.0:
   version "1.1.1"
@@ -4697,6 +4697,49 @@ eslint@^6.6.0:
     text-table "^0.2.0"
     v8-compile-cache "^2.0.3"
 
+eslint@^6.8.0:
+  version "6.8.0"
+  resolved "https://registry.yarnpkg.com/eslint/-/eslint-6.8.0.tgz#62262d6729739f9275723824302fb227c8c93ffb"
+  integrity sha512-K+Iayyo2LtyYhDSYwz5D5QdWw0hCacNzyq1Y821Xna2xSJj7cijoLLYmLxTQgcgZ9mC61nryMy9S7GRbYpI5Ig==
+  dependencies:
+    "@babel/code-frame" "^7.0.0"
+    ajv "^6.10.0"
+    chalk "^2.1.0"
+    cross-spawn "^6.0.5"
+    debug "^4.0.1"
+    doctrine "^3.0.0"
+    eslint-scope "^5.0.0"
+    eslint-utils "^1.4.3"
+    eslint-visitor-keys "^1.1.0"
+    espree "^6.1.2"
+    esquery "^1.0.1"
+    esutils "^2.0.2"
+    file-entry-cache "^5.0.1"
+    functional-red-black-tree "^1.0.1"
+    glob-parent "^5.0.0"
+    globals "^12.1.0"
+    ignore "^4.0.6"
+    import-fresh "^3.0.0"
+    imurmurhash "^0.1.4"
+    inquirer "^7.0.0"
+    is-glob "^4.0.0"
+    js-yaml "^3.13.1"
+    json-stable-stringify-without-jsonify "^1.0.1"
+    levn "^0.3.0"
+    lodash "^4.17.14"
+    minimatch "^3.0.4"
+    mkdirp "^0.5.1"
+    natural-compare "^1.4.0"
+    optionator "^0.8.3"
+    progress "^2.0.0"
+    regexpp "^2.0.1"
+    semver "^6.1.2"
+    strip-ansi "^5.2.0"
+    strip-json-comments "^3.0.1"
+    table "^5.2.3"
+    text-table "^0.2.0"
+    v8-compile-cache "^2.0.3"
+
 espree@^6.1.2:
   version "6.1.2"
   resolved "https://registry.yarnpkg.com/espree/-/espree-6.1.2.tgz#6c272650932b4f91c3714e5e7b5f5e2ecf47262d"
@@ -10168,9 +10211,9 @@ source-map-resolve@^0.5.0, source-map-resolve@^0.5.2:
     urix "^0.1.0"
 
 source-map-support@^0.5.6, source-map-support@~0.5.12:
-  version "0.5.16"
-  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.16.tgz#0ae069e7fe3ba7538c64c98515e35339eac5a042"
-  integrity sha512-efyLRJDr68D9hBBNIPWFjhpFzURh+KJykQwvMyW5UiZzYwoF6l4YMMDIJJEyFWxWCqfyxLzz6tSfUFR+kXXsVQ==
+  version "0.5.21"
+  resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.21.tgz#04fe7c7f9e1ed2d662233c28cb2b35b9f63f6e4f"
+  integrity sha512-uBHU3L3czsIyYXKX88fdrGovxdSCoTGDRZ6SYXtSRxLZUzHg5P/66Ht6uoUlHu9EZod+inXhKo3qQgwXUT/y1w==
   dependencies:
     buffer-from "^1.0.0"
     source-map "^0.6.0"
@@ -10645,19 +10688,10 @@ terser-webpack-plugin@^1.4.3:
     webpack-sources "^1.4.0"
     worker-farm "^1.7.0"
 
-terser@^4.1.2:
-  version "4.4.2"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-4.4.2.tgz#448fffad0245f4c8a277ce89788b458bfd7706e8"
-  integrity sha512-Uufrsvhj9O1ikwgITGsZ5EZS6qPokUOkCegS7fYOdGTv+OA90vndUbU6PEjr5ePqHfNUbGyMO7xyIZv2MhsALQ==
-  dependencies:
-    commander "^2.20.0"
-    source-map "~0.6.1"
-    source-map-support "~0.5.12"
-
-terser@^4.4.3, terser@^4.6.3:
-  version "4.6.4"
-  resolved "https://registry.yarnpkg.com/terser/-/terser-4.6.4.tgz#40a0b37afbe5b57e494536815efa68326840fc00"
-  integrity sha512-5fqgBPLgVHZ/fVvqRhhUp9YUiGXhFJ9ZkrZWD9vQtFBR4QIGTnbsb+/kKqSqfgp3WnBwGWAFnedGTtmX1YTn0w==
+terser@^4.1.2, terser@^4.4.3, terser@^4.6.3:
+  version "4.8.1"
+  resolved "https://registry.yarnpkg.com/terser/-/terser-4.8.1.tgz#a00e5634562de2239fd404c649051bf6fc21144f"
+  integrity sha512-4GnLC0x667eJG0ewJTa6z/yXrbLGv80D9Ru6HIpCQmO+Q4PfEtBFi0ObSckqwL6VyQv/7ENJieXHo2ANmdQwgw==
   dependencies:
     commander "^2.20.0"
     source-map "~0.6.1"